Hi Bill
Some years ago I made a sync pulse monitor for looking at the VCR back
tension post using a few LM555 timers, the horizontal sync was delayed 1/2
line and the frame sync was delayed 1/2 a frame, it worked well on the TV I
modified,
You might be able to do a similar project, except instead of delaying the
sync, you short the video to ground.
The 555 timers when used as one shot timers, it might seem a bit of a fiddle
not sure what temperature drift will do, you would have 2 line, and two
frame, timers one each to start the blanking and one each to end, getting
the timing down to about 5-10 microseconds for the width blanking might need
a bit of good timing. so if the logo was on the right side you would have
one timer at about 40µS and another at say 50µS so you would get blanking
in-between the two timers firing, and gate those with the frame timers.
I am glad you are keen to make one, and not me.
From Eric
built something to superimpose your own image on top of it. either your own
logo or something like minutes:seconds gone since the start of recording.
From Eric
Thanks to all for the responses. This is to Eric: do you know
exactly how to do that ? Your idea makes a lot of sense I wish I knew
how to do that(impose another image on top of the logo so it won't
show). Thanks.
Bill